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  #21  
Old 12th April 2019
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7000rpm is about maxed out on stock springs which is why I set mine at 6500. 7500 is asking for trouble and sooner than later it will find you. That Choo Choo train is huggin the tracks a little too tight.
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  #22  
Old 12th April 2019
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Mine is set @ 7400 but my valve springs are good to 8000. It pulls good all the way there and doesn't take long in doing it. Its gets there right now.

I wouldn't worry too much about a push rod motor turning a bunch of RPMs. The Buell XB9's with a factory 7500rpm rev limiter, and Buell XBRR shipped with a 9000rpm rev limiter, The problem on a stock motor is they run out of steam around 6000/6500 rpm.Changing cams with other work helps but the push rods and stock lifters don't hold you back.
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2014 Sportster Superlow, Hammer 1250, smash head work, 560 cams, S&S rockers and lifters. ported throttle body and intake,
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Last edited by hexnut; 12th April 2019 at 21:24..
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  #23  
Old 12th April 2019
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Quote:
Originally Posted by hexnut View Post
Mine is set @ 7400 but my valve springs are good to 8000. It pulls good all the way there and doesn't take long in doing it. Its gets there right now.

I wouldn't worry too much about a push rod motor turning a bunch of RPMs. The Buell XB9's with a factory 7500rpm rev limiter, and Buell XBRR shipped with a 9000rpm rev limiter, The problem on a stock motor is they run out of steam around 6000/6500 rpm.Changing cams with other work helps but the push rods and stock lifters don't hold you back.
What springs are you running, hex? I always thought the springs in the xb9 heads were only good to about 7000. 7500 max.
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Old 13th April 2019
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Hammer conical beehive spring set

We take your valve sizes up to the largest sizes that will fit in the stock seats: 1.770" intake and 1.530" exhaust valves, in our stainless swirl polished high flow 7mm stem versions. We pair these terrific valves with state-of-the-art conical springs and titanium retainers, a combination we've tested and proven stable to 8000rpm. Despite the tremendous rpm capability, spring pressures remain mild to minimize wear and tear.
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  #25  
Old 13th April 2019
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Hex
how many miles did you have rolled with that setup?
at what rpm range do you live?

i had kept my bike stock but for SE clutch and an OEM oil cooler...
since my riding stile (former metric imprinting) keeps me between 5k and 6k revs...
so in that way i'm sure to cause no harm at my bike...

i love to ride around the rev limiter a stock Sporty... it give you strange sensation compared to a metric bike... and even compared to more powerful configuration of HDs...

i'm not so sure if you can behave like this with a pumped up EVO... more powerful in all the curve lenght... but more sensitive to failure if being kept for long time at high revs...

maybe i'm wrong... i ask for my own knowledge...
but i had the impression that people who pump their Sporty to the limit (90 ci, massive heads job etc.) didn't roll many miles on their rides but used their creatures only for fun... and for sure did not keep their ride for long on the red line...
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Last edited by Nibelungen; 13th April 2019 at 02:18..
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  #26  
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I've put around 10,000 miles on the Hammer build. I do a lot of cruising in the 75 to 80 mph range. The bike runs so good. Its smooth with very little vibration. Its a joy to ride. I also like to get out and do full throttle runs and red line it through 3rd gear. I have to be careful in 4th or 5th. I will be going to fast for the public roads.. The bike revs really quick. and will get up to red line before you know it. Ive got an analog tach so I can keep an eye on the revs when out playing. I have not had one issue with the Hammer build. I would highly recommend it.
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  #27  
Old 13th April 2019
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uh
thanks for the answer
enjoy

ride safe
Daniele
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